BRK Section: Linux Programmer's Manual (2) Updated: 21 July 2025 Index   NAME brk, sbrk - change data segment size   SYNOPSIS #include <unistd.h> int brk(void *end_data_segment); void *sbrk(ptrdiff_t increment);   DESCRIPTION brk sets the end of the data segment to the value specified by end_data_segment. end_datasegment must be greater than end of the text segment and it must be 16kB before the end of the stack. sbrk increments the program's data space by increment bytes. sbrk isn't a system call, it is just a C library wrapper.   RETURN VALUE On success, brk returns zero, and sbrk returns a pointer to the start of the new area. On error, -1 is returned, and errno is set to ENOMEM.   CONFORMING TO BSD 4.3 brk and sbrk are not defined in the C Standard and are deliberately excluded from the POSIX.1 standard (see paragraphs B.1.1.1.3 and B.8.3.3).   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION RETURN VALUE CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:56:06 GMT, March 24, 2025